Monitoring tidal movements in Cook Inlet, Alaska, using the integration of remote sensing data, GIS, and inundation models
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1 Monitoring tidal movements in Cook Inlet, Alaska, using the integration of remote sensing data, GIS, and inundation models Hua Liu Department of political Science and Geography Old Dominion University (ODU), Norfolk, Virginia, USA Tal Ezer Center for Coastal Physical Oceanography (CCPO) & Virginia Modeling, Analysis & Simulation Center (VMASC) Old Dominion University (ODU), Norfolk, Virginia, USA Supported by: MMS (model development) NOAA/Fisheries (Belugas studies) ODU Office of Research (remote sensing)
2 Objective To investigate and map the tidal movements and associated changing water coverage over extensive mudflats, based on the integration of satellite remote sensing data, geographic information systems (GIS), and inundation models.
3 Significance The results will Allow the mapping of the topography of flood zones, and Improve inundation models that are used to simulate catastrophic floods such as those associated with hurricane storm surges and tsunamis
4 Methodology Study area. Remote sensing data processing. Water level prediction.
5 Cook Inlet: Subarctic Estuary Cook Inlet, Alaska Image source: Tal Ezer
6 Cook Inlet, Alaska Stretches 290 km from the Gulf of Alaska to the City of Anchorage. Receives water from its tributaries: Susitna River, Knik River & other streams. Contains active volcanoes. Large semi-diurnal tides (8-10 m range) 100s of square kilometers of mudflats are flooded twice daily (mostly M2 tide).
7 Photo of flood zone in upper Cook Inlet, Alaska (Knik Arm) during low tide Image source: Tal Ez
8 Mudflats in upper Cook Inlet (Turnagain Arm) during low tide
9 Upper Cook Inlet (Turnagain Arm) during high tide
10 POM-WAD Model (Oey, 2005, 2006) (POM with Wetting And Drying): 1. Curvilinear grid (0.5-1km) 2. Temp./Sal. stratification 3. Winds from local NOAA stations 4. Rivers runoff from USGS 5. Tidal forcing in south boundary Applications: 1. Processes: rip tides, tidal bores, etc. 2. Beluga whale movement 3. Remote sensing tidal forcing WAD zone Major Problems: 1. No reliable mudflat topography data 2. How to evaluate the model WAD? Solution: Remote sensing
11 References ( POM-WAD Inundation Model Oey L-Y (2005) A wetting and drying scheme for POM. Ocean Modelling, 9: Oey LY (2006) An OGCM with movable land-sea boundaries. Ocean Modelling, 13: Saramul, S. and T. Ezer, Tidal-driven dynamics and mixing processes in a coastal ocean model with wetting and drying, Ocean Dynamics, 60(2), , Cook Inlet Model Oey, L.-Y., T. Ezer, C. Hu and F. Muller-Karger, Baroclinic tidal flows and inundation processes in Cook Inlet, Alaska: Numerical modeling and satellite observations, Ocean Dynamics, 57, , doi: /s , Remote Sensing in CI Ezer, T. and H. Liu, Combining remote sensing data and inundation modeling to map tidal mudflat regions and improve flood predictions: A proof of concept demonstration in Cook Inlet, Alaska. Geophys. Res. Let., 36, L04605, doi:10.29/2008gl036873, Liu, H. and T. Ezer, Integration of Landsat imagery and an inundation model in flood assessment and predictions: A case study in Cook Inlet, Alaska, The 17 th International Conference on Geoinformatics, Fairfax, VA, August 12-14, IEEE Xplore Publ., Beluga Whales in CI Ezer, T., R. Hobbs and L.-Y. Oey, On the movement of beluga whales in Cook Inlet, Alaska: Simulations of tidal and environmental impacts using a hydrodynamic inundation model, Oceanography, Vol. 21, No. 4, , 2008.
12 Upper Inlet Processes: Mud flats wetting/drying Tidal bores Knik Arm Turnagain Arm
13 The transition of the salinity front with the tides is very different in the two arms (implication for biol.?) Knik Arm low tide high tide slow draining during ebb tidal bore Turnagain Arm
14 flood m/s Velocity and tide level in Turnagain Arm ebb
15 Ezer et al., Oceanography, Vol. 21, No. 4, December, 2008
16 NOAA Navigation Charts: No topography data for mudflats or upper Turnagain Arm! resolution: Δt~10s, Δx~500m resolution: Δt~16d, Δx~30-60m resolution: Δt~1-2d, Δx~ m
17 Remote Sensing Data Processing (samples from larger data set with many more images) Landsat Thematic Mapper (TM), Landsat Enhanced Thematic Mapper Plus (ETM+)
18 The inundation model lacks data on the shallow topography of the mudflats, so we have combined the model and remote sensing data (MODIS & Landsat in past studies, SPOT in the future) in order to improve flood prediction Landsat-ETM+ images during low and high tides
19 Remote Sensing Data Processing (Cont.) Geocorrection Reference: USGS digital raster graphics (DRGs) as reference. Supervised image classification Classes: water, wetland, & others. Image refinement. Image recoding Water & non-water.
20 Remote Sensing Data Processing (Cont.) Deriving the coordinates of water pixels along the shoreline. Using the coordinates as inputs to water level prediction.
21
22 How to project water level on shoreline? One way: run the 3D numerical model for each satellite image time too computationally expensive! Simpler way: use model statistics to form an analytical prediction (extrapolate WL from Anchorage to rest of upper CI) Water Level Prediction: η(x,y,t)=η obs (t)a 1 (x,y)cos[b 1 (x,y)]+c 1 (x,y) for Knik Arm η(x,y,t)=η obs (t)a 2 (x,y)cos[b 2 (x,y)]+c 2 (x,y) for Turnagain Arm η obs =observed WL in Anchorage A, B, C = empirical parameters obtained from the statistics of the inundation model
23 amplitude Knik Arm Anchorage Turnagain Arm phase Use these statistics to derive the coefficients for the prediction equation correlation between Anchorage and station 4
24 TESTING THE PREDICTION MODEL Numerical model high tide low tide Analytical prediction formula
25 Applications of the inundation modelremote sensing analysis: Studying the tidal cycle and calculating the area of the flooded zone Studying long-term morphological changes Derive new mudflat topography Evaluate model predicted WAD
26 EBB Shoreline and water level during one tidal cycle FLOOD
27 A1 A5 A4 A3 A2 A2 A4 A1 Water Level A3 A5 The inundated area of the mudflats were calculated for 5 sub-regions from the satellite data
28 Observing long-term morphological changes in the mudflats (all images taken ~2h after flood started in Anchorage) southern channel flow in the 1980s northern channel flow in the 2000s
29 3D CI topography derived from combining ~25 satellite images for inundated regions with model topography for deep regions
30 Eventually, the remote sensing analysis can be used to produce better topography for high resolution inundation models
31 Do Beluga Whale strandings relate to unexpected morphology changes? We are working with NOAA/Fisheries to use our remote sensing data to study this possibility
32 Discussions The limitations in spatial & temporal resolutions of Landsat data requires an integrated approach Combining available satellite data with different acquisition dates and times with sea level data from observations and from model simulations The methodology can be implemented for many other regions, for improving flood predictions and for studying coastal sea level change
33 Thank You!
On the Movement of Beluga Whales in Cook Inlet, Alaska: Simulations of Tidal and Environmental Impacts Using a Hydrodynamic Inundation Model
Old Dominion University ODU Digital Commons CCPO Publications Center for Coastal Physical Oceanography 1-008 On the Movement of Beluga Whales in Cook Inlet, Alaska: Simulations of Tidal and Environmental
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